gcc/ada/a-stunau.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --            A D A . S T R I N G S . U N B O U N D E D . A U X             --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-1998, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This child package of Ada.Strings.Unbounded provides some specialized
  35 --  access functions which are intended to allow more efficient use of the
  36 --  facilities of Ada.Strings.Unbounded, particularly by other layered
  37 --  utilities (such as GNAT.Patterns).
  38
  39 package Ada.Strings.Unbounded.Aux is
  40 pragma Preelaborate (Aux);
  41
  42    function Get_String (U  : Unbounded_String) return String_Access;
  43    pragma Inline (Get_String);
  44    --  This function returns the internal string pointer used in the
  45    --  representation of an unbounded string. There is no copy involved,
  46    --  so the value obtained references the same string as the original
  47    --  unbounded string. The characters of this string may not be modified
  48    --  via the returned pointer, and are valid only as long as the original
  49    --  unbounded string is not modified. Violating either of these two
  50    --  rules results in erroneous execution.
  51    --
  52    --  This function is much more efficient than the use of To_String
  53    --  since it avoids the need to copy the string. The lower bound of the
  54    --  referenced string returned by this call is always one.
  55
  56    procedure Set_String (UP : in out Unbounded_String; S : String);
  57    pragma Inline (Set_String);
  58    --  This function sets the string contents of the referenced unbounded
  59    --  string to the given string value. It is significantly more efficient
  60    --  than the use of To_Unbounded_String with an assignment, since it
  61    --  avoids the necessity of messing with finalization chains. The lower
  62    --  bound of the string S is not required to be one.
  63
  64    procedure Set_String (UP : in out Unbounded_String; S : String_Access);
  65    pragma Inline (Set_String);
  66    --  This version of Set_String takes a string access value, rather than a
  67    --  string. The lower bound of the string value is required to be one, and
  68    --  this requirement is not checked.
  69
  70 end Ada.Strings.Unbounded.Aux;